True negative total printing



April 8, 1952 LAMBERT 2,592,436

TRUE NEGATIVE TOTAL PRINTING MECHANISM Filed April' 5, 1945 12 Sheets-Sheet 1 311m HARRY L. LAMB T HIS Gttorn eg April 8, 1952 H. L. LAMBERT TRUE NEGATIVE TOTAL PRINTING MECHANISM l2 Sheets-Sheet 2 Filed April 3, 1945 3nventor mon .lill; 1

HIS Gttorneg 'll!!!lllllllllllllllllln A ril 8, 1952 H. L. LAMBERT TRUE NEGATIVE TOTAL PRINTING MECHANISM 12 Sheets-Sheet 3 Filed April 5, 1945 9 3 4 29 2 4 M x M 8 l 0 6 28 lnlnvl M F n H7 m ML MR 3 FIG.?

Ismaentof HARRY L; LAMBERT HIS (Ittorneg April 8, 1952 LAMBERT 2,592,436

TRUE NEGATIVE TOTAL PRINTING MECHANISM Filed April 3, 1945 l2 Sheets-Sheet 4 FIG.IO

3maentor HARRY L. LAMBERT HIS (Ittorneg April 8, 1952 H. L. LAMBERT TRUE NEGATIVE TOTAL PRINTING MECHANISM l2 Sheets-Sheet 5 Filed April 3, 1945 3nnentor HARRY L. LAMBERT HIS (Ittorneg April 8, 1952 H. L. LAMBERT TRUE NEGATIVE TOTAL PRINTING MECHANISM 12 Sheeis-Sheet 6 Filed April 3, 1945 m m m m a m m M m 3 m. G s L m R R A H m N8 -@1n m 8 S.. -2?

En n5 0% m3 aw u Q3 a. 6% .6 1 $0 April 8,- 1952 LAMBERT 2,592,436

TRUE NEGATIVE TOTAL PRINTING MECHANISM Filed April 3, 1945 12 Sheets-Sheet 7 Snnentor HARRY L. LAMBERT HIS (Ittorneg H. L. LAMBERT TRUE NEGATIVE TOTAL PRINTING MECHANISM April 8, 1952 12 Sheets-Sheet 8 Filed April 5, 1945 mm wmw 3 ow low Z'mpentor HARRY L. LAMBERT HIS (Ittorneg April 8, 1952' LAMBERT 1 2,592,436

TRUE NEGATIVE TOTAL PRI NTING MECHANISM Filed April 3, 1945 12 Sheets-Sheet 9 3nnentor HARRY L. LAMBERT BYM z HIS (Ittorneg April 8, 1952 H. LAMBERT 2,592,436

TRUE NEGATIVE TOTAL PRINTING MECHANISM Filed April 5, 1945 I 12 Shee s-Sheet 10 1M, '44 2l4 1 Q 210 64 .I F I G. I97 2 3 226' I I I 3maent6t HARRY L. LAMBERT BY M'M I HIS a ttorneg April 8, 1952 H. LAMBERT 2,592,436

TRUE NEGATIVE TOTAL PRINTING MECHANISM Filed April 5, 1945 12 Sheets-Sheet 11 FIG. 30

v Zmventor HARRY L. LAMBERT BYW'E HIS Gttomeg Patented Apr. 8, 1952 TRUE NEGATIVE TOTAL PRINTING MECHANISM Harry L. Lambert, East Rochester, N. Y., assignoi, by mesne assignments, to The National Cash Register Company, Dayton, Ohio, a corporation of Maryland Application April 3, 1945, Serial No. 586,369

25 Claims. 1

This invention relates to a calculating machine which can be operated to perform operations of addition and subtraction and the taking of positive and negative totals and sub-totals.

It is an object of the invention to provide an improved calculating machine capable of performing addition and subtraction and the taking of positive and negative totals and subtotals, in which machine various components making up the machine have been simplified and improved to improve their operation and to reduce the cost of manufacturing the machine.

Another object of the invention is to provide a novel calculating machine having a printing mechanism which can be easily controlled and can operate in a facile manner to print the true values of entries in adding and subtracting operations and the true values of positive and negative totals and sub-totals in total-taking and sub-total-taking operations.

Another object of the invention is to provide a, calculating machine in which a blank or extra operation of the machine is not required before a total-taking or sub-total-taking operation can take place following an amount-entering opertion.

, Another object of the invention is to provide simplified means for conditioning the machine to perform the various kinds of operations.

I Another object of the invention is to provide means whereby the shifting of the keyboard to subtracting position automatically initiates an operation of the driving mechanism of the machine.

Another object of the invention is to provide improved means whereby a negative total or subtotal can be taken and the true value of the negative total or sub-total recorded in an operation which is substantially the same as that in which a positive total or sub-total is taken and recorded. Another object of the invention is to provide a calculating machine which includes a single total key for controlling the taking of both positive and negative totals, and which also includes means controlled by the totalizer, according to Whether the total in the totalizer is positive or negative, and operable in a total-taking operation to control the printing means to convert the complement of a negative total to the true value of the negative total when the negative total is printed.

Another object of the invention is to provide a calculating machine which includes a single sub-total key for controlling the taking of positive and negative sub-totals, and which also includes means controlled by the totalizer, ac-

2 cording to whether the total in the totalizer is positive or negative, and operable in a sub-totaltaking operation to control the printing means to convert the complement of a negative total to its true value when a negative sub-total is printed.

Another object of the invention is to provide a novel printing mechanism which is selectively operable to print values or the complements of the values and which is provided with zero printing control mechanism operable in either 'typeof operation.

Another object of the invention is to provide novel anti-slam means for preventing the improper operation of the differential means in. total-taking and sub-total-taking operationsl Another object of the invention is to providenovel totalizer engaging means and controls therefor.

Another object or" the invention is to provide an improved transfer mechanism which can be completely restored from operated condition early in a succeeding operation of the machine.

Another object of the invention is to provide means whereby the highest denominational order wheel of the totalizer can control the entry of an amount in the lowest denominational order wheel of the totalizer.

Another object of the invention is to provide novel controls for the line-spacing mechanism to enable a long feeding of the paper to occur after a total or a sub-total has been printed.

Another object of the'i'nvention is to provide a novel record material guiding means'in connection with the platen, said guiding means being effective to guide record material from the rear of the machine to printing position and be ing also effective to allow front-feed insertion of record material into printing position.

Another object of the invention is to provide a novel yieldable connection between the driv-i ing motor and the main drive shaft of the machine to prevent damage if some part of the machine should become blocked against normal operation.

With these and incidental objects in. view, the invention consists of certain novel features'oi construction and combinations of parts, the es--v sential elements of which are set forth inappended claims and a preferred form or embodiment of which is hereinafter described with reference to the drawings which accompanyand Fig. l is a perspective view of the novel. ma-.

chine.

Fig. 2 is a vertical section through the machine, showing the mechanism associated with, and controlled by, one denominational row of keys on the keyboard.

Fig. 3 is a view showing the relation between various elements of the tens transfer mechanism.

Fig. 4 is a sectional view of a portion of the keyboard taken along line 44 (Fig. 3) showing the Subtract key and the means associated therewith.

Fig. 5 is a side elevation of a portion of the keyboard showing in particular the Correction key and the means associated therewith.

Fig. 6 is an elevation of a portion of the keyboard shown in Fig. 5, as seen from the front of the machine and in a direction parallel with the plane of the top of the keyboard.

Fig. '7 is a front elevation of a portion of the keyboard, showing the keyboard in its normal or adding position.

Fig. 8 is a plan view showing a portion of the keyboard and a portion of the means for rendering the machine driving mechanism operative, and showing in particular the manner in which the shifting of the keyboard to the right in a subtracting operation is efiective to initiate an operation of the driving mechanism.

Fig. 9 is a section through a portion of the keyboard, showing an amount key and its relation to the keyretaining plate and the zero stop operating bail.

.Fig. 10 is a plan view of the machine with the keyboard and certain other parts removed to show the differential mechanism and certain of the machine controls more clearly.

Fig. 11 is a side elevation view of the right side of the machine.

Fig. 12 is a detail view showing a portion of the means for releasing the driving mechanism for operation.

Fig. 13 is a side elevation view of the left side. of the machine.

. Figs. 14 and 15 are detail views of the pressure rollers which cooperate with the platen, and of the'means for releasingthem from engagement with the platen.

Fig. 16 is a side elevation showing the totalizer, the printing mechanism, and a portion of the differential mechanism.

, Fig. 17 is a detail view of the means for shifting thetype wheels to effect printing.

' Fig. 18 is a perspective view of the basket which supports the double-rack members in the printing mechanism.

Fig. 19 is a side elevation, taken inside the right sidev frame of the machine, showing the means by which the control keys can exert their control in'non-add operations and in total-taking and sub-total-taking operations.

' Fig. 20 is a detail view of certain parts of the mechanism shown in Fig. 19, showing in particular the controls which are efiective in a nonadd operation.

Fig. 21 is a detail view of certain of the mechanism shown in Fig. 19, showing in particular the controls which are efiective in total-taking and sub-total-taking operations.

Fig. 22 is a detail of a portion of the means shown in Fig. 19, showing the totalizer-engaging mechanism and the controls therefor, and the positions which they assume in total-taking and sub-total-taking operations.

Fig. 23 is a detail view of a type wheel and a portion of the double-rack member, showing the normal relation between these parts.

izer.

Fig. 2'7 is a detail or" a portion of the mechanism shown in Fig. 20, showing the totalizer-engaging mechanism and the controls therefor in the positions which they assume during a non-add operation.

Fig. 28 shows the printing mechanism in home position and shows the means for controlling the engagement of the type wheels with the racks of the double-rack member.

Fig. 29 shows the printing mechanism in partially moved position, with the type wheels shifted into engagement with the racks which set them in adding operations, and shows the control by which the shifting of thewheels is obtained in adding and positive total-taking and subtotal-taking operations.

Fig. 30 is similar to Fig. 28, showing the printing mechanism in home position, but with the machine set for subtraction or negative totaltaking or sub-total-taking operations.

Fig. 31 is a perspective View showing the train of mechanism for controlling the engagement of the type wheels with either of the racks of the double-rack members in adding and subtracting operations, and according to whether the total is positive or negative in total-taking and subtotal-takin operations.

Fig. 32 is a detail of a portion of the mechanism of Fig. 31, showing in particular the means controlled by the totalizer for controlling the operation of the printing mechanism in total-taking and sub-total taking operations, according to whether the total in the totalizer is positive or negative.

Fig. 33 is a front elevation of a portion of the printing mechanism and a portion of the totalizer-engaging mechanism.

Fig. 34 is a detail view showing the ribbon shifting means.

Fig. 35 isa detail view of a portion of the mechanism for controlling the printing of zeros.

GENERAL DESCRIPTION The novel machine, which is shown in perspective in Fig. 1, is capable of performing adding, subtracting, and non-add operations and the taking of positive and negative totals and sub-totals.

The particular machine which is used to illustrate and explain the invention is a power-driven machine in which the operation of'- the driving means is initiated by the depression of any of a plurality of control keys located at the right of the machine, each of which control keys also causesthe machine to perform a desired type of operation such as addition, subtraction, non-add,

and the taking of totals and sub-totals.

As shown in Fig. 1, the machine is provided with a keyboard containing six denominational rows of amount keys and a row containing certain ones of the control keys.

The keyboard, which is mounted for limited lateral bodily movement in the'machine, is nor-- mally located in its leftmost position to control the operation of the differential mechanism in adding operations, in which position the amount keys can control the movement of the difi'erential mechanism extents corresponding to the amount set up on the keys to cause this amount to be entered additively into the totalizer.

Subtraction is effected in the novel machine by the method of complementary addition. In order to obtain the complements in the subtracting operation, the keyboard is shifted to the right a slight distance from its'normal position. In the shifted position of the keyboard, the amount keys can control the movement of the differential mechanism extents corresponding to the nines complement of the amount set up on the keys to cause this complement to be entered additively into .the totalizer.

As shown in Fig. 1, the totalizer provided in the novel machine contains seven totalizer wheels, one for each of the rows of keys on the keyboard, and an overflow wheel. which is located to the left of the totalizer wheel corresponding to the highest denominational row of keys on the keyboard.

In adding and subtracting operations, the totalizer is disengaged from the differential mechanism during the first half of a machine cycle while the differential mechanism is being set different extents under control of the keys, and is engaged with the difierential mechanism during the second half of a machine cycle in these operations to enable the entries to be made into the totalizer as the differential mechanism is restored from its set positions. Due to the fact that, in the instant machine, subtraction is effected by complementary addition, the totalizer wheels will be rotated in the same direction for subtraction as for addition.

The highest denominational order wheel of the totalizer, or the overflow wheel, is effective to cause an entry of a value of one to be made automatically in the lowest denominational order wheel of the totalizer each time the highest order wheel passes from its nine position to or through its zero position. In the normal operation of the machine within its capacity, this automatic entry of the value of one will occur in all subtracting operations except the one in which a positive total in the totalizer becomes negative, and will occur in the adding operation in which a negative total becomes positive.

The operation of the machine in performing addition and subtraction may be understood more clearly from the following numerical example in volving several additions and subtractions.

(3) Subtract 175 (4) Subtract 129 (5) Add 88 (6) Add '75 In the operation (1) above, the amount 275' is set up onthe keyboard and is entered additively into the totalizer.

In the operation (2) above, the amount is set up on the keyboard, and, in a subtracting op eration, the nines complement of this-amount is entered additively into the totalizer and added to the amount therein to obtain the amount 0000149. During the entry of the complement of 125 in the totalizer, the highest denominational order wheel of the totalizer will pass from its nine" position to its zero position and will cause a value of one to be entered automatically into the lowest denominational order of the totalizer to cause the amount in the totalizer to be changed from 149 to 150, which is the correct amount resulting from the subtraction.

In the operation (3) above, the amount is set up on the keyboard, and, in another subtracting operation, the nines complement of this amount is entered additively into the totalizer and added to the amount therein to obtain the amount 9999974. In this operation, the amount subtracted was larger than the amount in the totalizer and caused the total in the totalizer to become negative, the value 9999974 being the nines complement of the negative total of 25; It should be noted that in this operation the highest denominational order wheel did not pass from its nine position to its zero position, and there was no automatic entry of one" into the units denominational order wheel of the totalizer, which totalizer remains set at the end of the operation to represent the nines complement of the negative total of 25, which is the correct amount resulting from this subtraction.

In the operation (4) above, the amount 129 is set up on the keyboard, and, in a further subtracting operation, the nines complement of this amount is entered additively into the totalizer and added to the nines complement of the nega-- tive total therein to produce a setting of 9999844. In this operation, the highest denominational order wheel of the totalizer passed from its ninef position through its zero position and caused the automatic entry of one in the lowest denominational order of the totalizer to change the value in the totalizer from 9999844 to 9999845, which is the nines complement of the truenegative total of 154 which resulted from the subtraction of 129 from the negative total of 25.

In the operation (5) above, the value 88 is set up on the keyboard, in an adding'operation, and is entered additively into the totalizer and added to the amount therein to change the setting thereof from 9999845 to 9999933. During this operation, the highest denominational order wheel of the totalizer did not pass from its nine" position to or through its zero position, and the value of one was not automatically entered into the lowest denominational order wheel of the totalizer. Since the amount added was'less than the amount of the negative total previously in the totalizer, the totalizer, at the end of the operation, will be set to 9999933, which is the nines complement'of the new negative total of- 66, which is the correct amount resulting from title gligebraic addition of 88 to the negative total 0 1 In the operation (6) above, the amount 75 is set up on the keyboard, and, in another adding operation, this amount is added to the pines complement of the negative total of 66, previously in the totalizer. to produce a setting in the totalizer of 0000008.- The highest. denomina i sult to be obtained by the algebraic addition of 75 to the negative total of 66.

From the above example it is seen that the totalizer is always set to the true value of-any positive total and to the nines complement of any negative total. It is seen further that, in order to obtain these conditions, there will be an automatic entry of a value of, one in the lowest denominational order of the totalizer in all subtracting operations except the one in which a positive total becomes negative, and such also will occur in an adding operation in which a negative total becomes positive. In the novel machine, the means which are set under control of the totalizer to control whether or not a tens transfer will occur between adjacent orders of the totalizer is so constituted that it can be completely restored from its operated position early in a succeeding operation of the machine. before the differential mechanism begins its operation. This eliminates the requirement that a blank or extra operation of the machine be made before a total-taking or sub-total-taking operation can take place.

A single total key is provided for causing the machine to go through the necessary operations in the taking of positive and negative totals. Inthe total-taking operation, regardless of whether the total is positive or negative, the totalizer is engaged with the difierential mechanism at the beginning of the operation, and, during the first half of the machine cycle of the operation, the difierential mechanism rotates the totalizer wheels in the reverse direction from that in addition and subtraction, until the wheels are stopped in their zero positions. When the wheels have been stopped in their zero positions, the differential mechanism will have been displaced extents corresponding to the value which was on the totalizer at the beginning of the operation; that is, the true value of the total if the total was positive or the nines complement of the total if the total was negative. The totalizer is disengaged from the differential mechanism during the second half of the ,machine cycle and remains in its zeroized or cleared condition.

A single sub-total key is provided for causing the machineto go through the necessary operations in the taking of positive and negative subtotals. The sub-total-taking operation is similar to the total-taking operation in that the totalizer is engaged with the differential mechanism during the first half of the machine cycle of the operation and controls the setting of the differential mechanism according to the amount of the total if the total is positive and according to the nines complement of the total if the total is negative. In the sub-total-taking operation, however, the totalizer remains engaged with the differential mechanism during the second half of the machine cycle, and the amount'standing on the totalizer at the beginning of the operation is returned to the totalizer as the differential mechanism is restored to its home'position.

The novel machine contains a printing mech-- anism which includes-a series of type wheels. These type wheels are driveniorward and backward selectively from an initial position by means 01' double-rack members which are operated dif".

ferent'extents bythe difierential .operation,of

the differentialmechanism. In adding opera tions, gears secured to the type wheels mesh with one of the racks on the double-rack members, and, when-the differential mechanism is moved extents corresponding to the values on the keys. the type wheels are moved corresponding extents in one direction to positions to print these values. In subtracting operations, the gears on the type wheels mesh with the other racks on the doublerack members, and, when the differential mechanism is moved extents corresponding to the nines complement of the value on the keys, the type wheels will be reversely rotated to positions to place the type representing the nines complement of the nines complement, or the true value the typewheels move in either direction, to en-.

able zeros to be printed to the right of the highest denomination in which a significant digit is.

to be printed and to prevent the printing of zeros to the left of this particular denomination.

With this novel form of printing mechanism,

therefore, the true value of amounts set upon the keyboard in adding and subtracting operations are printed, even though, in subtracting operations, the differential mechanism is operated I according to the nines complement of the amount set up on the keyboard. v In a similar manner, the printing mechanism is effective to print the true amount of the total} or sub-total whether the total inthe totalizer,

be positive or negative. When the total is positive, the gears on the type wheels are meshed with the same racks on the double-rack mem- JGlS as in adding operations, and the type wheels are set to positions to print values corresponding to the different extents of movement which the differential mechanism is given during the totalor sub-=total-taking operation, so that the true value of the positive total is printed. When the total in the totalizer is negative, the gears on the type wheels are meshed with the other racks on the double-rack members, as in subtracting operations. It will be recalled that negative to tals are registered on the totalizer wheels in complementary form and consequently as the differential is set under control of the totalizer, when it has a negative total registered therein, the differential moves according to said complementary amount and the type wheels, turning reversely such amount, are set to bring the type representing the true negative total to printing position. Accordingly, the printing of the true value of positive or negative totals and sub-totals is obtained simply by controlling with which racks of the double-rack members the gears on the type wheels will he in mesh.

The meshing oi the gears on the type wheels with one or the other of the racks on the doublerack members is controlled by the lateral position of the keyboard in adding and subtracting operations and by the position of the highest denominational order wheel of the totalizer in totaland sub-total-taking operations.

Non-add operations of the novel machine are substantially the same as adding operations except that the totalizer is kept disengaged from the diiierential mechanism in the second half of the machine cycle as well as in the first half, and no entry is made in the totalizer.

The. details of the various mechanisms by which the above operations and controls are obtained will now be explained.

DETAILED DESCRIPTION The novel machine is provided with a suitable outer casing 50 (Figs. 1 and 2), which is secured to the side frames 5| and 52 (Figs. 2, 4, 5, 6, 7, 8, 10, 11, 13, 19, and 33) of the machine by screws as 53 (Fig. 1), which extend into spacing lugs as 54 (Figs. 7, 1O, 11, and 13),which project from the side frames. This method of securing the outer casing to the machine frame enables the casing to be readily removed when it is desired to service the machine.

The side frames 51 and 52 are retained in proper spaced relation by various cross bars and rods and serve to support the various mechanisms of the machine, as will be explained hereinafter when the various mechanisms are considered.

Keyboard The keyboard of the instant machine (Figs. 1 and '7) is provided with six denominational rows of amount keys 8|, which are used to set up the amounts to be entered in adding and subtracting operations, each row of keys containing a key for each of the digits 1 to 9. Also provided in the keyboard, to the right of the amount keys 8|, is a row of control keys containing a Subtract key 82, a Non-Add key 63, a Total key 64, and a Sub-Total key 85, which keys, when depressed, are effective to cause the machine to operate to perform subtracting and non-add operations and the taking of positive and negative totals and sub-totals.

The amount keys 6! of the various rows are mounted in the keyboard in a manner similar to that in which the amount keys are mounted in the keyboard of the machines disclosed in United States Patent No. 1,386,021, issued to Heber C. Peters on August 2, 1921, and in United States Patent No. 2,062,731, issued to Charles 'Schroder on December 1, 1936.

Referring to Figs. 2 and 9, it will be seen that each of the keys is provided with a stem 10, which is guided in the top and bottom plates H and 12 of the keyboard. Each key is urged yieldingly and resiliently in an upward direction by a coil spring 13, which surrounds the lower end of the key stem 10 and acts between a shoulder of the key stem and the bottom plate 12 of the keyboard. Each key stem is also provided with a slot 14 at approximately the section which passes through the top plate H of the keyboard. A bar or rod 15 passes through the slots 14 of the keys of each row and, by engagement with the ends of the slots, limits the extent of endwise movement of each key.

One side of the key stem of each key of a row is provided with an upper latching notch 16 and a lower clearance notch 11, which cooperate with a spring-urged latchingplate 18 to enable any key in the row to be latched in depressed position. The latching plates 18 (Figs. 2 and 9) are pivoted upon rods '19, which extend from the front to the rear of the keyboard at one side of each row of keys and are supported by front and rear plates 80 and 8| of the keyboard. When the keys of a row are in their uppermost positions, the latching plate 18 will enter into the lower or clearance notches 11; however, when any key is pushed downwardly, the latching plate 18 for that row will be cammed out of the lower notch 11 and will enter into the upper notch 16 in the stem of that key to latch the key in its depressed position. Since all the keys in a row are engaged by the same latching plate 18, the

camming of the plate 18 by the depression of any key in the row will move the plate 18 from engagement with the latching notch 16 in the stem of any previously depressed key and will cause the previously depressed key to be released.

The opposite edges of the key stems are also provided with cam surfaces for operating a zero stop operating bail 82, which is pivoted on the rod 19 that carries the latching plate for the next row of keys to the right. The zero stop operating bail 82'carries at its front edge a zero stop 83, which extends downwardly through the bottom plate T2. v I V The latching plate i8 and the zero stop operat.- ing bail 82, which are mounted on the same rod 19, are urged into engagement with their rejlated keys by a spring (Fig. 2) carried by the rod 19, one end of the spring engaging the zero stop operating bail and the other end of the spring engaging the latching plate mounted on the same rod.

In an adding operation, when none of the keys in the row is depressed, the lower end of the zero stop 83 will be in position to block the operation of the differentially operable means associated with that row of keys, but, whenever a key in the row is depressed, the cam surfaceon that key stem will cam the related zero stop operating bail 82 to one side, to remove the lower end of the zero stop 83 from blocking relation with the differentially operable means to allow this means to be set differentially under control of the keys.

The control keys (Fig. 4) also have key stems which are formed with latching notches, clearance notches, and cam surfaces, for cooperation with a latching plate 18 and a zero stop operating bail 82 in the same manner as the amount keys 6|. The control keys, when depressed, are effective to control the operation of a differentiallyoperable means associated therewith and, in addition, are provided with depending extensions, as, for example, the extension 84 of the Subtract key 62 (Fig. 4), by which they can exert the necessary control over the operation of the machine to perform the differenttypes of operations.

The usual key releasebail 8'! (Figs. 2, 5, 6, '7', and 11) extends across the front of the keyboard and is pivoted on studs 88 and 89, which extend from the front part of the side frames 90 and? of the keyboard. The key release bail 81 is provided with rearwardly extending fingers 92 (Figs. 2 and 9) opposite the various, rows of amount keys. When the key release bail 81 is rocked clockwise (Fig. 2) upon the studs 88 and 89, the fingers 92 will rock the latching plate '18 and the zero stop operating balls 82 out of engagement with the amount keys to release any depressed amount keys and to move the zero stops from blocking relation with their related differentially operable means. The key release bail 81 is also provided with a finger 93, which is associated with the bank of control keys, but this finger is ineffective to rock the latching plate 18 or the zero stop operating bail 82 associated with these keys when the key release bail is rocked about the studs 88 and 89.

- In adding and subtracting operations, thebail 81 is rocked automatically at the end of a machine cycle operation to release the keys which have been set to control the entry in that operside frames 5I and 52.

ation. This automatic rocking of the key re- ;wise by a spring Il connected to an upward extension of the lever and to a stud I02 on the side plate 9 I, but in the normal condition of the machine the release lever is maintained in the position shown in Fig. '11, by the engagement Iof'a depending arm I03 at the rear end of the lever 99 with a stud I04 on a plate I05 secured to a main shaft I06, which is journaled in the When the machine begins to operate, the plate I05 is rocked counterclockwise, causing the stud I04 to move away from the depending arm I03 of the lever .99 and allow the spring IOI to rock the lever clockwise about the stud I00. The forward end of the key release lever 99 is provided with a Icy-pass pawl I 01, which, in the clockwise movement of the lever 99, idly passes a roller I08 on an arm I09 extending rearwardly from the key release ball 81., Upon the return of the plate I05 to its home position, the stud I04, engaging thearm I03 of the key release lever 99, will rock the lever counterclockwise to the position shown in Fig. 11, and,

during the counter-clockwise movement of the key release lever 99, the by-pass pawl I01 will engage the roller I08 and rock the key release bail ,81 clockwise (Figs. 2 and 11) to release the amount keys.

In addition to its being capable of pivotal movement about the studs 88 and 89, the key release bail 81 is also capable of limited movement crosswise of the keyboard. As shown in Fig. 7, the key release bail 81 is urged toward the right ofthe keyboard by a spring I I5, compressed beltion key H6 is connected to a lever II8 by a pin 1, which extends through a suitable opening in the side plate 9| of the keyboard, the lever H0 being pivoted on a stud H9 on the side plate 9I.

The lever I I8 is urged clockwise about the stud by a spring I23 connected to the rear end of the lever,. and, at its forward end, the lever has a bent-over portion which is provided with a cam surface I20 (Fig. 6) cooperable with a roller I2I on the key release bail 81. When the Correction key I I6 is depressed, it will depress the front end of the lever II8, causing the cam surface I20 to engage the roller I2I to shift the key release ball 81 to the left and enable the fingers 92 and 93 to shift the latching plates 18 associated with the; amount keys and the control keys, and will shift these latching plates out of engaging relation with the keys, thereby to release any key which may have been depressed. The forward end of the lever H8 is provided with a slot I22,

which embraces the stud 89 and, in conjunction with an enlarged head on the stud, is effective to support the end of the lever I I8 when it is camming the key release bail 81 to the left.

The amount keys and the control keys of the keyboard are provided with a further locking means similar to the one shown in the abovementioned Schroder patent. The notched side of each'of the key stems is provided with a mg I 26 located below the lower or clearance notch 11. Cooperating with these lugs I26 is a locking strip I21, which extends along the row of keys and is rockably supported on the bottom plate 12 of the keyboard by means of lugswhich extend into suitable openings in the bottom plate.

The locking strip I21 is provided with a flange I28 so located relatively to the lugs I26 that, when the locking strip is rocked, the flange can pass under the lugs I 29 of the keys which are undepressed to prevent these keys from being depressed and can pass over the lug I20 of a depressed keyto prevent the key from being restored completely from depressed position during a machine cycle of operation.

The rocking of the locking strip I21 is caused by a bar $29 (Fig. 4), which extends across the keyboard at a point adjacent the rear plate BI and is notched along its lower edge to receive the upper edge of the locking strip. The bar I29 is urged to the right of the keyboard by a spring I 30 (Fig. 13), connected to the side plate 90 of the keyboard and extending through the bar I29, until a cam surface I3I on the right end of the bar engages a bent-over extension I32 (Figs. 4 and 11) of the key release lever 90. In the normal unoperated condition of the machine, --the rear end of the lever 99 is maintained in its upward position by the stud I04, and, as shown in Fig. 4, the lateral extension I32 on the lever, cooperating with the cam surface I3I, is efiective to maintain the bar I29 in its leftmost position, which positions the locking strip I21 with the flange I28 out of engaging relationwith the lugs I20 on the key stems. When the machine is operated and the spring IOI is allowed to rock the key release lever 99 clockwise, the lateral extenslon I32 moves downwardly (Fig. 4), releasing the bar I29 for movement to the right by the spring I90. This movement of the bar' I29 to the right causes the locking strips I21 to rock and place their flanges I23 in cooperative relation with the lugs I20 on the key stems to maintain the keys in their depressed or undepressed positions during the operation of the machine. As the plate I05 returns to its home position near the end of the machine cycle of operation, the stud I04 will rock the lever 99 counterclockwise (Fig. 11), and the extension I 82 will move into engagement with the camming surface I3I to shift the bar I29 to the left and rock the locking strips I21, thus removing the flanges I28 from engaging relation with the lugs I20, and freeing the keys.

As explained earlier herein, the key release ball 81 is ineffective to release the control keys when the bail is rocked about studs 88 and 89. Accordingly, other means must be provided to release the control keys automatically near the end of each machine operation. These means are shown particularly in Fig. 4, in which is shown a lug I secured to the bottom plate 12 of the keyboard at a point adjacent the row of control keys, and pivoted to this lug is a lever I II having one arm in the path of movement of the locking strip I21 associated with the row of control keys and having another arm associated with the latching plate 18 associated with this row of keys. As the locking strip I21 is rocked by the bar I29 early in the operation of the machine, the flange I29 will engage the arm of the lever MI and rock the lever counterclockwise about the pivot, causing the other arm of the lever MI to engage the latching plate 18 to move it from engagement with the notches in the keys and-release the keys from the control of the latching plate 18. However, while the keys are released from the control of the latching plate at this time, any depressed key will still be held in its depressed position by the flange I28 engaging the log I28 on that key; Near the end of theopera tionof the machine, when the bar I29 is restored to the left, the flange will be removed from above the lug on the depressed key, and that key can then be restored to its undepressed position.

The entire keyboard is mounted for bodily movement laterally of the machine. As seen in Figs. 2 and 11, the rear edges of the side plates 90 and 9| of the keyboard are notched to enable the plates to straddle and slide laterally on trunnions I 43 and I44 (see also Fig. 10) secured to the side frames and 52 of the machine. The side plates 90 and SI are also provided adjacent their front ends with downwardly extending portions I41 and I48 (Figs. '1 and 11), whichv are notched to fit over and slide. laterally on studs I49 and I50 (Fig. extending inwardly from. the side frames 5| and. 52, respectively.

This form of mounting of the keyboard in the' machine. enables the keyboard to be placed in the machine simply by slipping the notches in the side plates 90 and BI over the trunnions I43 and I44 and lowering the notches in the downwardly extending portions I41 and I48 over the studs I49 and I50.

In order to maintain the studs I49 and I50 in the notches in the downwardly extending portions I41 and I48 of the keyboard and thereby retain the keyboard in proper position in the machine, suitable retaining means are provided. A retaining member I5I, secured to the front plate 80 of the keyboard, extends downwardly therefrom and carries a roller I52, which engages the under side of a cross bar I53 secured in the side frames 5| and 52, to thereby retain the keyboard in proper position with the studs I48 and I50 securely engaged in the notches in the downwardly extending portions of the side plates 90 and 9|. While the retaining member I5I retains the studs I49 and I50 in the notches, it does not prevent shifting of the keyboard laterally of the machine.

The keyboard can be removed from the machine merely by loosening the-retaining member I5I from the front plate 80 sufficiently to allow the roller I52 to be moved forwardly to clear the cross bar I53, then raising the front of the keyboard to remove the notches in the downwardly extending portions I41 and I48 from the studs I49 and I50 and slipping the keyboard forwardly until the notches in the plates 80 and 9| are removed from the trunnions I43 and I44.

The keyboard normally is located in its leftmost position, where it is urged, at the front of the keyboard, by a spring I55 (Fig. 7) connected between the member I5I and a pin I56 on a cross frame I51 secured between the side frames 5| and 52 and, at the rear of the keyboard, by a spring-urged plunger I58, which is journaled in the side frame 5| and engages a downward extension of a bracket I59 secured to the bottom plate 12 of the keyboard and extending from the left 01 the keyboard near the back thereof.

The means for shifting the keyboard from its normal position to the right in subtracting operations will be explained fully when the oper ation of the machine in a subtracting operation is considered.

Diflerential mechanism The diflferential mechanism used in the novel machine is substantially like the one shown and described in my co-pending United States patent application, Serial No. 475,129, which was filed February 13, 1943, now Patent No. 2,445,225.

The difierential mechanism includes a ditferentially operableomeans for operating an over.- fiow totalizer wheel,and adifferentially operable means for each of the denominational rows of amount keys 6| and for the row of control keys on the keyboard. Since all of the differentially operable means associated with the rows olf amount keys are alike, and the other difieren tiallyioperable means are similar thereto, it is believed that an understanding of the construction and operation of these means will be clear from a description. of the difierentially operable means associated with one of the denominational rows of amount keys.

A stop bar I (Figs. 2, 7, l0, and 16) is located. immediately below the row of amount keys. when the keyboard is in its normal. leftmost position. The stop bar I65 is pivotally con;- nected at its rear end to an upwardly extending I55 of a diverging lever and is suitably guided at its forward end'in aslot in a support-.- ing plate I61 so as to be movable longitudinally immediately below the keys. A spring I68 (Fig. 2), which is connected to the stop bar I65 and to the supporting plate I61, normally urges the stop bar to the left, as seen in Fig. 2, and, when the machine operates, the stop bar will be moved to the left by the spring I68 until it engages the zero stop 83 if no key is depressed, or untilone of the abutments on the upper edge of the bar engages the lower end of a depressed key. The ahutments on the upper edge of the stop bar I65 are so spaced along the stop bar that, when one of them engages .its respective key, it will limit the movement of the stop bar I65 to an extent which corresponds to thevalue of. that key.

The diverging lever is pivotally mounted on a diverging lever shaft IE9, which is journaled in the side frames 5| and 52. A totalizer actuating rack I15 (Figs. 2 and 3) is mounted onthe upper end of the upwardly extending arm I56 of the diverging bar by means of a pair of shouldered studs |1| on the rack, which slide freely within the slots I12 in the upwardly extending arm I66 of the diverging lever and is urged rearwardly by a spring 213 connected to a bent-over ear I14 at the front of the rack I10 and to the arm I66 of the diverging lever, which spring tends to move the studs Hi to the rear end of the slots I12. Since the diverging lever is connected to the stop bar I65, it will move with the stop bar and will be controlled in its extent of movement by the engagement of the stop bar with the zero stop 83 or by the engagement of one of the abutments with a depressed key. As" the stop bar moves to its zero position, where it would be engaged by the zero stop 83, the diverging lever moves a like extent, but the rack I10 remains in home position because at this time the spring 513 causes the rack to move relatively to the arm Hit of the diverging lever until the studs |1I move from their normal positions in the slots I12, as shown in Fig. to the rear ends of the slots. If any key has been depressed, the stop bar will move past its zero position and will continue to move until one'of the abutments on the stop bar engages the depressed key, and the actuating rack I10, which is carried by the diverging lever and is controlled by the stop bar, will be given a movement from its home position sumcient to cause an entry corresponding to the value of the depressed key to be made in the totalizer.

As the diverging lever is returned to its home position, a laterally extending lug I15, secured to the actuating rack I10, will engage a transfer lever latch I16, if no transfer is to be made, and will arrest further rearward movement of the actuating rack I70, causing the spring I13 to be tensioned as the studs III move from the rear ends of the slots I12 to the middle of the slots, as shown in Fig. 3.

The diverging lever is also operable to control the setting of the type wheel I86 in the printing mechanism to cause the amount set up on the keys to be printed. A rearward extension I19 of the diverging lever is connected by a link I8I to a double-rack member I82. The double-rack member I82 is effective to set the type wheel in a manner which will be explained fully hereinafter, the double-rack member I82 being provided with a stud I83, which is retained in a hole in the lower end of the link MI by a spring clip I56.

The stop bar I55 and the diverging lever are normally held in. their home positions, as shown in Fig. 2, by means of a cross bar H35, which engages the front edge of the upwardly" extending arm I56 of the diverging lever and retains the diverging lever and the stop bar in this position against the action of the spring I68. The cross bar I85 extends across the machine and is supported near the top of arms I86 and I81 (see also Fig. 19), which are secured to the shaft I69 at points on either side of the group of diverging levers, but within the side frames and 52.

The arm l8? (Fig. 19), which is secured to the shaft IE9 at the right side of the machine, has a downward extension which carries a roller I89. The roller I89 extends into a cam-slot H98 in a lever l9I secured to the main shaft I06 of the machine. The cam slot 590 is so shaped that, when the main shaft is rocked counter-clockwise during the first half of a machine cycle of operation, the cross bar I85 will be moved forward, at the proper time, a distance sufficient to accommodate the maximum displacement required of the stop bar and the diverging lever. As the cross bar I85 moves forward, the spring I58 will yieldingly move the stop bar and the diverging lever with the cross bar until the stop bar and the diverging lever are stopped in their proper displaced positions, as determined by the zero stop or by the depressed key, after which the cross bar will leave the front edge of the upwardly extending arm I58 of the diverging lever and continue its movement to the maximum extent as determined by the shape of the cam slot I90. When the main shaft returns to its normal position shown in Fig. 2, the cam slot will cause the cross bar I85 to move to the right into the positionshown, and the cross bar in its return movement picks up the diverging lever and the stop bar in their set positions and carries them with it back to their normal positions.

In the operation of the machine for addition, the totalizer will be engaged with the differential mechanism during the'return movement of the diverging lever by the cross bar I85, and the totalizer wheel related to this differentially operable means will be rotated clockwise, as seen in Fig. 2, to enter into the totalizer an amount corresponding to the value represented by the displacement of the diverging lever.

The differentially operable means associated with the overflow wheel of the totalizer operates in the same manner as the differentially operable means described above. However, since there are no amount keys in the keyboard to cooperate with the stop bar I 65 to control its extent of movement, the zero stop for this differentially operable means will remain in blocking position in all adding operations, and the stopbar. and, thediverging' Accordingly, the difierential mechanism can be controlled by the keyboard in operation of ,the machine for addition to cause the entry into the totalizer of such amounts as are set up thereon by the depression of the keys.

The differentially operable means associated with the row of control keys is similar to the one associated with the amountkeys. This differentially operable means, however, is merely used to set a symbol type wheel I88 to place symbols indicating the various types of operations in printing position and accordingly is not provided with a rack similar to the rack no. In adding operations, none of the control keys is depressed,and the differentially operable means associated with this row of keys will be stopped by its zero stop 83.

Totalizer The totalizer (Figs. 1, 2, 10, and 16) consists of seven totalizer wheels I95 including an overflow wheel, and a wheel for each denominational row of amount keys. The totalizer wheels are mounted in a totalizer supporting frame that is rockable to engage and disengage the totalizer with and from the differential mechanism.

The totalizer supporting frame is composed of a plurality of plates I96, which are secured in proper spaced relation on a shaft I91 and are connected in proper spaced relation near their rear ends to a suitable rod I98. The frame thus formed is rockable about the trunnions I43 and HM, which extend into recesses in the ends of the shaft I91.

Extending through and secured to the plates I95 near their rear ends is a rod I99 (Fig. 16), upon which the totalizer wheels I are individually rotatable. Each totalizer wheel I hasia gear 280 connected to it on the right (Figs. 2 and 16) by a spacing sleeve, and has a tens. transfer cam 2M (Fig. 10) suitably connected to it on the left. The totalizer wheel unit thus formed occupies the space between adjacent plates I96, which serve to retain the unit in its proper lateral position. The trunnions I43 and IM are adjustable in the side frames 5! and 52 to enable the totalizer to be moved crosswise of the machine to aline the gears 20!! with the actuating racks nn.

Alining means is associated with the totalizer to prevent the totalizer wheels 95 from'being accidentally displaced when their associated gears 2% are disengaged from the actuating racks I'ifl. The alining means consists of a series of alining plates 2&2 (Figs. 2 and 10), which are secured to a pair of rods 203 and 28d fastened to the side frames SI and 52. These plates 292 are located opposite the gears 2%. and each plate 202 is formed. with a tooth 2535-, which can be engaged by its related gear-2B0 when the totalizer is disengaged from the differential mechanism, and can prevent undesired rotation of the totalizer Wheel unit.

The mechanism by which the engagement and disengagement of the totalizer with and from the differential mechanism is effected will now be described.

Totalizcr engaging mechanism In an adding operation, the totalizer normally i engagement with the differential mechanism, is disengaged from the differential mechanism during the first half of the machine cycle of 

